Improvement in forming stamped articles from sheet-zinc



UNITED STATES PATENT- OFFICE.

ALFRED T. PERKINS, OF TOLEDO, OHIO, ASSIGN OR OF ONE-HALF OF HIS RIGHTTO NEHEMIAH WATERMAN, OF SAME PLACE.

IMPROVEMENT IN FORMING STAMPED ARTICLES FROM SHEET-ZINC.

Specification forming part of Letters Patent N 0. 127,101, dated May21,1872

Specification of an Improved Process for. Temperin g and Stamping SheetMetal, invent ed by ALFRED T. PERKINs, of Toledo, in the county of Lucasand State of Ohio.

My invention relates chiefly to the stamping or striking up ofsheet-zinc, and to the striking up of other sheet metal into such formsas involve or necessitate the stretching of the metal. It is ,ased uponthe fact that in striking up or stamping sheet metal it is important tohave the metal at a uniform temperature throughout, and at theparticular temperature which renders it most tough and ductile.

This consideration is of especial importance in treating sheet-zinc. Theproperties of this metal are such as to cause peculiar difficulty inworking it. It is deficient in ductility at ordinary atmospherictemperature, and it fuses at a heat but little above that at which itsgreatest ductility is reached. For this reason serious wastage resultsin the usual method of heating by furnaces or ovens. The greatdifficulty in striking up zinc results from this neby immersing the thedies and the metal, which is essential to the operation. I

I In carrying 'out my invention I have used linseed-oil with good effectbut I purpose using any liquid which may be found suitable.

I claim- As an improvement in tempering and stamp" ing sheet metal,heating the metal, through the medium of oil or other suitable liquid,as a preliminary to stamping, substantially as set forth.

ALFRED T. PERKINS. Witnesses:

I. P. PUG-SLEY, WALTER ALLEN.

